NAME gnutls_ia_set_server_avp_function - API function
SYNOPSIS #include <gnutls/extra.h>
void gnutls_ia_set_server_avp_function(gnutls_ia_server_credentials_t cred, gnutls_ia_avp_func avp_func);
ARGUMENTS gnutls_ia_server_credentials_t cred is a gnutls_ia_server_credentials_t structure.
DESCRIPTION Set the TLS/IA AVP callback handler used for the session.
The callback s function form is: int (*avp_func) (gnutls_session_t ses- sion, void *ptr, const char *last, size_t lastlen, char **next, size_t *nextlen);
The session parameter is the gnutls_session_t structure corresponding to the current session. The ptr parameter is the application hook pointer, set through gnutls_ia_set_server_avp_ptr(). The AVP received from the client is present in last of lastlen size. The newly allo- cated output AVP to send to the client should be placed in *next of *nextlen size.
The AVP callback is called to process incoming AVPs from the client, and to get a new AVP to send to the client. It can also be used to instruct the TLS/IA handshake to do go into the Intermediate or Final phases. It return a negative error code, or a gnutls_ia_apptype_t mes- sage type.
The callback may invoke gnutls_ia_permute_inner_secret() to mix any generated session keys with the TLS/IA inner secret.
Specifically, return GNUTLS_IA_APPLICATION_PAYLOAD (0) to send another AVP to the client, return GNUTLS_IA_INTERMEDIATE_PHASE_FINISHED (1) to indicate that an IntermediatePhaseFinished message should be sent, and return GNUTLS_IA_FINAL_PHASE_FINISHED (2) to indicate that an Final- PhaseFinished message should be sent. In the last two cases, the con- tents of the next and nextlen parameter is not used.
Note that the callback must use allocate the next parameter using gnutls_malloc(), because it is released via gnutls_free() by the TLS/IA handshake function.
REPORTING BUGS Report bugs to <email@example.com>. GnuTLS home page: http://www.gnu.org/software/gnutls/ General help using GNU software: http://www.gnu.org/gethelp/
COPYRIGHT Copyright © 2008 Free Software Foundation. Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.
SEE ALSO The full documentation for gnutls is maintained as a Texinfo manual. If the info and gnutls programs are properly installed at your site, the command
should give you access to the complete manual.